225744637 has 4 divisors (see below), whose sum is σ = 226470816. Its totient is φ = 225018460.

The previous prime is 225744599. The next prime is 225744691. The reversal of 225744637 is 736447522.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 225744637 - 2⁷ = 225744509 is a prime.

It is a super-2 number, since 2×225744637² = 101921282268523538, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 225744637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225744737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362623 + ... + 363244.

It is an arithmetic number, because the mean of its divisors is an integer number (56617704).

Almost surely, 2^225744637 is an apocalyptic number.

It is an amenable number.

225744637 is a deficient number, since it is larger than the sum of its proper divisors (726179).

225744637 is an equidigital number, since it uses as much as digits as its factorization.

225744637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726178.

The product of its digits is 282240, while the sum is 40.

The square root of 225744637 is about 15024.8007307917. The cubic root of 225744637 is about 608.8904285261.

The spelling of 225744637 in words is "two hundred twenty-five million, seven hundred forty-four thousand, six hundred thirty-seven".